I had recently to deploy one, the other way around: from CRMOnline to a CRM2013 instance. In my case the solution contained only html, png and Javascript webresources.

The entity dependencies for the solution, were already present in the CRM2013 organisation. The CRM2013 organisation was on SP1 UR1 (6.1.1). Refer to https://support.microsoft.com/en-us/kb/2917899 if you are on a higher/lower rollup and modify the version number appropriately.In order to import the CRMOnline solution I had to